I have built several multi band systems over the ears, and my favourite for playing solo bass guitar is a three way top, similar to a fearful, with a 1X18 sub; it is all driven by active crossovers and separate power amps. I built these for gratification and just because, .....If you are playing in a band with no PA support for instruments, (not uncommon) - this would work but in a band with a proper PA, you'd be best advised not to use a sub unless you know how to filter off the competing 'sub' frequencies. I use a 50Hz roll off and frankly I still prefer to bring out 1X18 sub sometimes, the overall sound is cleaner and the 12" driver is not strained as much. But I usually take a pair of 1X12 3 way or a 1X15 3 way, as my needs are for a bass guitar monitor, usually. Have also used a 4 band PA system, with no bass monitoring on stage, just in ears.